Daniël,
it sounds like Roger only has the source to
some of the
system - probably an application program, perhaps one that he wrote
himself. Presumably he doesn't have the source to any of the lower
level bits that actually control the hardware directly.
I have only a vague understanding of what a "laser trimming system"
is, but it looks big and expensive.
As for why Roger is asking here, well if I
Google for OMSI Pascal,
right now the 4th hit is this
Don's PDP-11 Pascal compiler
post! (Funny, I guess there's not a lot of info on late 1970's
compilers on the web...) So he's here because of you, Don!